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Investments (Purchased Financial Assets with Credit Deterioration) (Details) - Residential Mortgage Loans
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Contractual Principal $ 48
ACL at Acquisition 0
Non-Credit (Discount) Premium (3)
Purchase Price $ 45